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One method of obtaining channel information for closed-loop SU-MIMO or MU-MIMO is for the mobile to feed back a covariance matrix based on the measured downlink channel. However for MU-MIMO to be able to operate properly (i.e., have low crosstalk), the covariance matrix must be fed back with fairly high precision which would result in a very high level of overhead. This paper describes two new methods...
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